Traveling step-by-step power jack



Aug. 8, 1967 BERGAMINO 3,334,866

TRAVELING STEP-BY-STEP POWER JACK Filed May 10, 1966 INVENTOR.

- ABerjamdno ATTORNEYS United States Patent 3,334,866 TRAVELING STEP-BY-STEP POWER JACK Anthony Bergamino, 115 Walnut St.,

Nutley, NJ. 07110 Filed May 10, 1966, Ser. No. 548,992 '3 Claims. (Cl. 254-108) ABSTRACT OF THE DISCLOSURE A power jack adapted for pressing chucks into mill rolls but also suitable for other purposes, has an elongated body provided with a row of teeth and a housing slidable upon the body. Both the body and the housing carry sleeves which may fit over a shaft. The housing carries a swingable arm pivotally connected with a slide which can engage the teeth. The housing also carries a lever which can be used to press the slide firmly against the teeth by means of a spring.

This invention relates to a manually operable power jack.

The construction of the present invention is particularly applicable, although not limited to core jacks used for pressing chucks into mill rolls.

In paper slitting machines it is necessary to drive cone type chucks into mill roll cores on unwind shafts. The usual procedure is to use a heavy sledge hammer for this purpose. This was found to be unsatisfactory since it greatly fatigues the operator and often results in injury to the equipment. Attempts to replace sledge hammers by hydraulic core jacks were not successful due to high costs involved and the difiiculty of adapting such hydraulic jacks to various existing operational requirements.

An object of the present invention is to eliminate these drawbacks of prior art devices and operations.

Another object is to provide a power jack of general use which, however, is particularly suitable for driving a cone into the core of a mill roll, which will' avoid any danger of injury to the equipment and which will carry out the required operations in a very short time and with the smallest amount of exertion on the part of the operator.

Other objects of the present invention will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention it was found desirable to construct a power jack having an elongated body provided with an upper row of teeth and carrying a sleeve. Another aligned sleeve is carried by a housing. A single screw carried by the lastmentioned sleeve is suflicient to firmly clamp the jack in working position upon an unwind shaft. The housing which is slidably mounted upon the jack body carries a swingable arm pivotally connected with a slide which is adapted to engage the teeth individually. A spring which may be a flat spring or a coiled spring, is actuated by a lever mounted upon an outer surface of the housing and is used in an operative position to press the slide firmly against the teeth. Then mere manipulation of the arm will suffice to operate the jack, so that it will push the shaft and thereby drive the cone into the core of the mill roll.

The force exerted by the jack is entirely adequate for this operation. The use of the jack requires very little time, does not fatigue the operator and avoids any injury to the equipment. Particularly, the use of this jack completely eliminates loosening and damage to the mill r-oll core while unwinding. Obviously, the sleeves can be made of any desired size and can be made exchangeable to adapt the jack to several shaft diameters.

The invention will appear more clearly from the fol lowing detailed description when taken in connection with 3,334,866 Patented Aug. 8, 1967 the accompanying drawings showing by way of example, a preferred embodiment of the inventive idea.

In the drawing:

FIGURE 1 is a side view of a power jack constructed in accordance with the principles of the present invention.

FIGURE 2 is an end View.

FIGURE 3 is a section through the housing, some parts being shown in side elevation.

The power jack shown in the drawings includes an elongated body 10 having a central ridge 11 carrying teeth 12. Guideways 13 and 14 are provided on opposite sides of the ridge 11. One end of the body 10 may have a stop 15 to prevent unintentional removal of the housing 16. The opposite end of the body 10 carries a sleeve 17 which extends downwardly from the jack body and is firmly connected therewith.

The inner diameter of the sleeve 17 is the same as that of a sleeve 18 which is suspended from the housing 16 and is in alignment with the sleeve 17. The sleeves 17 and 18 are shown as being mounted on the mill roll shaft 19. The sleeve 18 carries a manually operable screw lock 20 by means of which the sleeve 18 is firmly locked upon the shaft.

Since all other parts used for driving cone chucks are of standard construction, they are not illustrated in the drawings. Furthermore, as already stated, the power jack of the present invention is capable of a variety of other uses.

The housing 16 has two side walls 21 and 22 extending on opposite sides of the jack body and also above and below the jack body. The walls 21 and 22 have curved portions 23 and 24 the inner surfaces of which slide upon the guideways 13 and 14, respectively. The lower portions of the side walls 21 and 22 are joined by a portion 25 which extends under the jack body and which carries the sleeve 18. As already stated, the sleeve 18 carries the lock 20 for connection to the shaft 19.

The tops of the walls 21 and 22 are joined by a cover 26 which is integral therewith. However, the cover 26 does not extend the entire length of the Walls so as to provide room for a swingable operating arm 27.

The arm 27 is preferably made of a bent sheet. The portion of the arm extending above the housing 16 has a round hollow end portion 28 and two flat sides 29 and 30 which are pressed against each other. Thus a rod (not shown) may be conveniently inserted into the hollow portion of the arm so as to operate it from a distance. Inside the housing 16 the sides 29 and 30 are spread apart so that they extend close to the inner surfaces of the side walls 21 and 22.

The arm 27 is pivotally mounted within the housing 16 by a pin 31 extending through the side walls 21 and 22 of the housing and the sides 29 and 30 of the arm. A pressure member 32 is located within the housing. Furthermore, a pin 33 connects the arm 27 with a slide 34 having the shape of an inverted U in cross-section. The slide 34 has an end embracing the ridge 11 and fitting between the teeth 12. A projection 35 carried by the inner surface of the wall 22 of the housing is used to limit the upward swinging movement of the slide. The projection 35 may be cut and bent out of the wall 22 or it may be fixed thereto by soldering or the like. A spring 36 extends along the inner surface of the wall 21 and presses against the slide 34. The spring 36 may be actuated by a projection 37 of an operating lever 38. The lever 38 is mounted upon a pin 39 on the outer surface of the wall 21 while its projection 37 extends through an opening 40 inside the housing 16 and is adapted to engage the spring 36. FIG. 1 shows the lever 38 in full lines in its inoperative position in which little if any pressure is exerted upon the spring 36. However, the lever 38 may be swung and locked. in an operative position shown in broken lines in FIG. 1,

wherein its projection 37 exerts elfective pressure upon the spring 36 which in turn presses the slide 34 against the teeth 12.

The operation of the power jack is apparent from the above description. The operator mounts the sleeves 17 and 18 of the jack upon the mill roll shaft 19 and fixes the jack on the shaft by the screw 20. The lever 38 is swung to its upper operative position. Then the jack is operated merely by swinging the arm 27. The force which it will exert will be entirely adequate to drive a cone type chuck into a mill roll core on an unwind shaft.

It is apparent that the example described above has been given solely byway of exemplification and not by way of limitation and that it is subject to many variations and modifications within the scope of the present invention. For example, springs of other types than those illustrated can be used and in general, the construction of the power jack can be somewhat modified to adapt it to other uses. All such and other variations and modifications are to be included within the scope of the present invention.

What is claimed is:

1. A power jack, comprising an elongated body having a central ridge, guideways on opposite sides of said ridge and a row of uniform teeth upon said ridge, a sleeve suspended from said body, a housing having two spaced side walls, said side walls having portions engaging said guideways, whereby said housing is slidable upon said body, said housing further having a lower portion integral with said side walls and extending under said body, a sleeve suspended from said lower portion, said two sleeves being in alignment, and a cover integral with said side Walls and extending over a portion of said side walls, said side walls having another open portion, an

arm extending through said open portion into said housing and having a round portion and two flat sides, said flat sides within said housing being spaced from each other and extending adjacent the inner surfaces of said side walls, a pin extending through said side walls and said sides and pivotally mounting said arm in said housing, a slide having the shape of an inverted U in cross section and adapted to embrace said ridge and to fit between said teeth, a pin carried by said arm and carrying said slide, said two pins being spaced from each other, a spring engaging said slide, and a lever swingably mounted upon an outer surface of one of said side walls and having a projection extending through an opening formed in said one side wall and engaging said spring to press said spring against said slide and cause said slide to press against one of said teeth.

2. A power jack in accordance with claim 1, further comprising a pressure member pivotally mounted upon said arm and adapted to engage said teeth.

3. A power jack in accordance with claim 1, further comprising a projection carried by an inner surface of one of said side walls and located above said slide for limiting the upward movement of said slide.

References Cited UNITED STATES PATENTS OTHELL M. SIMPSON, Primary Examiner.

6/1926 Weiss et al 29-256 I 

1. A POWER JACK, COMPRISING AN ELONGATED BODY HAVING A CENTRAL RIDGE, GUIDEWAYS ON OPPOSITE SIDES OF SAID RIDGE AND ROW OF UNIFORM TEETH UPON SAID RIDGE, A SLEEVE SUSPENDED FROM SAID BODY, A HOUSING HAVING TWO SPACED SIDE WALLS, SAID SIDE WALLS HAVING PORTION ENGAGING SAID GUIDEWAYS, WHEREBY SAID HOUSING IS SLIDABLE UPON SAID BODY, SAID HOUSING FURTHER HAVING A LOWER PORTION INTERGRAL WITH SAID SIDE WALLS AND EXTENDING UNDER SAID BODY, A SLEEVE SUSPENDED FROM SAID LOWER PORTION, SAID TWO SLEEVES BEING IN ALIGNMENT, AND COVER INTEGRAL WITH SAID SIDE WALLS AND EXTENDING OVER A PORTION OF SAID SIDE WALLS, SAID SIDE WALLS HAVING ANOTHER OPEN PORTION, AN ARM EXTENDING THROUGH SAID OPEN PORTION INTO SAID HOUSING AND HAVING A ROUND PORTION AND TWO FLAT SIDES, SAID FLAT SIDES WITHIN SAID HOUSING BEING SPACED FROM EACH OTHER AND EXTENDING ADJACENT THE INNER SURFACES OF SAID SIDE WALLS, A PIN EXTENDING THROUGH SAID SIDE WALLS AND SAID SIDES AND PIVOTALLY MOUNTING SAID ARM IN SAID HOUSING, A SLIDE HAVING THE SHAPE OF AN INVERTED U IN CROSS SECTION AND ADAPTED TO EMBRACE SAID RIDGE AND TO FIT BETWEEN SAID TEETH, A PIN CARRIED BY SAID ARM AND CARRYING SAID SLIDE, SAID TWO PINS BEING SPACED FROM EACH OTHER, A SPRING ENGAGING SAID SLIDE, AND LEVER SWINGABLY MOUNTED UPON AN OUTER SURFACE OF ONE OF SAID SIDE WALLS AND HAVING A PROJECTION EXTENDING THROUGH AN OPENING FORMED IN SAID ONE SIDE WALL AND ENGAGING SAID SPRING TO PRESS SAID SPRING AGAINST SAID SLIDE AND CAUSE SAID SLIDE TO PRESS AGAINST ONE OF SAID TEETH. 